A rail union is to unveil a mobile advertising billboard to explain to racegoers why its members are striking on the day of the Grand National.
Members of the Rail, Maritime and Transport union at Merseyrail will walk out for 24 hours on Saturday in a dispute over driver-only operation on new trains.
The action, coupled with a strike on Arriva Trains North over the same issue, will affect passengers going to the big race at Aintree.
The union said the advertising billboard will tour Liverpool and Aintree on Saturday explaining to race goers why the RMT is taking strike action to defend safety-critical guards.
Merseyrail has announced a special timetable, with trains running to Aintree before the start of the Grand National and after the race ends.